The only cafe and store on the island is just a block from the ferry landing. Anderson's General Store offers a bit of everything, including good coffee, sandwiches, and a few local beers on tap. There is a nice veranda and outdoor seating area overlooking bay and ferry terminal. They do have Wi-Fi but it's somewhat slow.
I commenced my circle tour of the island in a counter-clockwise direction. With only 500 people living on the island there was hardly any car traffic. In fact, I was passed by less than a dozen cars and hardly ran across any humans. The island is very quite. The ride was a combination of moderate hills and flat areas. But there were three steep but short steep hills to climb. Later, from local knowledge, I learned that it is easier for bikers to do the loop in a clockwise direction.
I visited the Guemes Island Resort which is tucked away in the Northern tip of the island. The cabins are right on the pebble beach. There is a community game room, common kitchen area, sauna and massage. Four yurts are also available. Bring your own food and drinks. There is a food truck which moved on the island recently and is at the resort from Thursday to Sunday in the summer.
I finished the day by riding back to downtown Anacortes and had an early dinner at the Rock Fish Grill (calamari, San Juan salad and a locally brewed porter draft.